EARTH

ABOUT EARTH:

Our Earth is the most beautiful planet in our solar system. Earth is the planet we live on. The earth is a habitat for millions of species of plants and animals. Earth is an integral part of the solar system. Earth is the third planet from the sun. Earth is the fifth-largest of the planets in the solar system. The alternative names for the earth are Gaia, Gaea, Terra, Tellus, the world, the globe. Earth is a planet of the Sun which is also called Blue Planet because of the availability of water and it looks blue when observed from space. It’s the only planet known to have an atmosphere containing free oxygen, oceans of water on its surface, and, of course, life. Water covers 70 percent of Earth’s surface. Earth has an atmosphere containing 21% oxygen which helps in the survival of living beings. The gases like nitrogen, CO2, and oxygen in the earth’s atmosphere help plants to grow. Our planet Earth is a rotating sphere that orbits the Sun. Earth is made of rocks and came into existence billions of years ago. Along with the movement, Earth also rotates on its axis from east to west and completes a rotation in 24 hours which we call a solar day. The Earth is located approximately 150 million kilometers from the Sun and this distance is known as Astronomical Unit. It takes about 8.3 minutes for sunlight to reach the Earth. The Earth’s Atmosphere Extends to a Distance of 10,000 km. Earth’s atmosphere nourishes life and protects it from harmful UV rays and meteorites. Earth Day is observed every year on 22nd April to protect the environment. Along with human earth is home to millions of species and plants. The presence of water on the surface of the earth and air in the atmosphere makes life possible here. As the only livable planet of the sun, we should respect and protect our earth from our wrong practices.

STRUCTURE OF EARTH:

​​The earth is made up of three different layers. They are,

· THE CRUST:

This is the outside layer of the earth and is made of solid rock, mostly basalt, and granite. There are two types of a crust; oceanic and continental. Oceanic crust is denser and thinner and mainly composed of basalt. Continental crust is less dense, thicker, and mainly composed of granite.

· THE MANTLE:

The mantle is the layer located directly under the sima. It is the largest layer of the Earth, 1800 miles thick. The mantle is composed of very hot, dense rock. This layer of rock even flows like asphalt under a heavyweight.

· THE CORE:

Earth’s core is the very hot, very dense center of our planet. The ball-shaped core lies beneath the cool, brittle crust and the mostly-solid mantle. The core is found about 2,900 kilometers (1,802 miles) below Earth’s surface and has a radius of about 3,485 kilometers (2,165 miles). The core is made of two layers: the outer core, which borders the mantle, and the inner core. The outer core, about 2,200 kilometers (1,367 miles) thick, is mostly composed of liquid iron and nickel. The inner core is a hot, dense ball of (mostly) iron. It has a radius of about 1,220 kilometers (758 miles). The temperature in the inner core is about 5,200° Celsius (9,392° Fahrenheit). The pressure is nearly 3.6 million atmospheres (atm).

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